GT4 Performance Springs These air cups are pneumatically

These air cups are pneumatically controlled and expand when pressure is applied

This small change increases comfort for daily driving and even long distance drives

For inquires and questions email info@designsbyjacob

This extreme pressure increases the strength of the aluminum by eliminating porosity and improving the grain structure

Powdercoated in matte black

GT4 Performance Springs These air cups are pneumaticallyGT4 Swift Spring upgrade kit: Upgrade your stock springs to 448lb in front and 560lbs in the rear! These spring rates have shown to reduce camber loss during cornering and can improve tire wear while on track. Fortunately the factory OEM shocks are capable of handling these stiffer springs without the need to revalve. Stiffer spring rates are also needed to handle higher aerodynamic loads. These springs will help compensate for the increased loads.